I'm pretty sure not. Gojira are though. If they were the other way around this tour would make sense.

I have noticed in the past few months on my facebook page that I get asked about Ghost as much if not more than most other bands not named Avenged Sevenfold, Alice In Chains and System of a Down. I really think the tour with Opeth/Mastodon really boosted their popularity, along with Hetfield and Anselmo sporting Ghost shirts in every other interview/live performance.